Actually, Walter Cronkite was mistaken on a detail. He said the Warren Commission concluded that the first shot was fired at frame 210. And the last shot at frame 313.
While their were some involved in the investigation that thought the first shot occurred at, or shortly after frame 210, some disagreed. While their may have been a small majority (I think) of the investigators who thought the shots were confined between z210 to z313, there was enough doubt to give no definite scenario in the final report. They said there was a shot around z210 and z313 but the other shot could have been before z210 or between z210-z313. This was a wise decision.
In the sixty years since then, with more analysis of the Zapruder film, there is now a general consensus among LNers that the:
* first shot: hardest to pin down, but may have been around z152 (my view). In any case, well before z221.
* second shot: universal consensus that the second shot was at z221-z225.
* third shot: universal consensus that the third shot was at z312-z313.
That consensus seems to be that the 40+ witnesses who distinctly recalled that the last two shots were closer together and "in rapid succession" or "followed rapidly by another shot” or “The second two shots were immediate --- it was almost as if one were an echo of the other -- they came so quickly. The sound of one did not cease until the second shot.” … “and then the third shot came very, very quickly, on top of the second one” were all mistaken.
That consensus also seems to be that photographers Hugh Betzner, Phil Willis and Ike Altgens were completely wrong in when their photos were taken relative to the first shot.
And the consensus also is that Nellie Connally (along with about 20 others) was hallucinating about seeing JFK react to the first shot before the second shot, and that JBC never turned his neck to see JFK after the first shot and before he was hit in the back.
The SBT is the biggest reason conspiracies abound. There is abundant evidence that conflicts with it, not just the shot pattern. It is not just the witness evidence that strains belief. It is the position of JBC, his wounds and CE399. I do not understand why LNs refuse to consider the plausible alternative to the SBT that fits all the evidence and is still consistent with the overwhelming evidence that Oswald fired all three shots.
However, the general consensus among CTers is, well, there is no general consensus among CTers. No CTer has ever come up with a compelling scenario, even among just their fellow CTers.
No argument there.